netdev - [PATCH net-next v7 14/24] bridge: restore br

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Message-Id: <1431276489-64199-15-git-send-email-sfeldma@gmail.com>
Date:	Sun, 10 May 2015 09:47:59 -0700
From:	sfeldma@...il.com
To:	netdev@...r.kernel.org
Cc:	jiri@...nulli.us, roopa@...ulusnetworks.com, linux@...ck-us.net,
	f.fainelli@...il.com, andrew@...n.ch, simon.horman@...ronome.com,
	joe@...ches.com, sridhar.samudrala@...el.com, ronen.arad@...el.com
Subject: [PATCH net-next v7 14/24] bridge: restore br_setlink back to original

From: Scott Feldman <sfeldma@...il.com>

This is revert of:

commit 68e331c785b8 ("bridge: offload bridge port attributes to switch asic
if feature flag set")

Restore br_setlink back to original and don't call into SELF port driver.
rtnetlink.c:bridge_setlink() already does a call into port driver for SELF.

bridge set link cmd defaults to MASTER.  From man page for bridge link set
cmd:

       self   link setting is configured on specified physical device

       master link setting is configured on the software bridge (default)

The link setting has two values: the device-side value and the software
bridge-side value.  These are independent and settable using the bridge
link set cmd by specifying some combination of [master] | [self].
Furthermore, the device-side and bridge-side settings have their own
initial value, viewable from bridge -d link show cmd.

Restoring br_setlink back to original makes rocker (the only in-kernel user
of SELF link settings) work as first implement: two-sided values.

It's true that when both MASTER and SELF are specified from the command,
two netlink notifications are generated, one for each side of the settings.
The user-space app can distiquish between the two notifications by
observing the MASTER or SELF flag.

Signed-off-by: Scott Feldman <sfeldma@...il.com>
Acked-by: Jiri Pirko <jiri@...nulli.us>
---
 net/bridge/br_netlink.c |   11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index dc23453..e9b9435 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -586,7 +586,7 @@ int br_setlink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags)
 	struct nlattr *afspec;
 	struct net_bridge_port *p;
 	struct nlattr *tb[IFLA_BRPORT_MAX + 1];
-	int err = 0, ret_offload = 0;
+	int err = 0;

 	protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO);
 	afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
@@ -628,15 +628,6 @@ int br_setlink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags)
 				afspec, RTM_SETLINK);
 	}

-	if (p && !(flags & BRIDGE_FLAGS_SELF)) {
-		/* set bridge attributes in hardware if supported
-		 */
-		ret_offload = switchdev_port_bridge_setlink(dev, nlh, flags);
-		if (ret_offload && ret_offload != -EOPNOTSUPP)
-			br_warn(p->br, "error setting attrs on port %u(%s)\n",
-				(unsigned int)p->port_no, p->dev->name);
-	}
-
 	if (err == 0)
 		br_ifinfo_notify(RTM_NEWLINK, p);
 out:
-- 
1.7.10.4

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